Goldschmidt Conference Abstracts 929

Nanoparticles of X-ray amorphous Statistical evaluation of the Holocene mineralogical substances climate parameters in the NE of YE.A. GOLUBEV European Russia (from palynological Institute of Geology, Syktyvkar, 167982, Russia data) ([email protected]) YU.V. GOLUBEVA* AND YE.A. GOLUBEV

Representations about the particular ultradisperse Institute of Geology, Komi Science Centre, Ural Division of structural state of x-ray amorphous mineralogical substances RAS, 167982 Syktyvkar, Russia, (mineraloids), distinct from atomic-molecular are developed (*correspondence: [email protected]) [1-4]. For mineraloids it are find out and in details described submicro-nanoscale structures of natural solid bitumens, fossil In the given work present paleoclimatic investigation resins, of some inorganic metacolloids by HRTEM, STM, included palynological and statistical analyses, radiocarbon AFM, SEM. This has allowed revealing various species of dating of the Holocene lake, alluvial (oxbow lake) and swamp superstructural orderings in mineraloids, to define its sediments in middle and northern taiga subzones of the Komi mechanisms, to allocate key value of influence of the heating Republic. On the basis of cores of four boreholes and fourteen factor for the sizes nanoparticles in organic mineraloids. outcrops, synchronous spectra correlation and Holocene Results of studying submicro-nanoscale structures and separation were accomplished [1]. mechanisms of their ordering are important for modifying Mean annual and July temperatures were estimated by technological properties of natural substances, making of zonal method of the Holocene paleoclimates reconstruction geomaterials. Special interest cause mineraloids with [2], based on palynological assemblages for characteristics of periodically-ordered nanoscale structures like noble opal has environmental changes during the interval. It has been aroused. The similar regular structures are characteristic for a established that the sediments accumulated during the row organic and inorganic mineraloids. Preboreal–Subatlantic interval, when repeated climatic changes occurred. To determine the main trends of paleoclimate changes [1] Golubev (2005) Journal of Crystal Growth 275, e2357- climatic curves have been drawn. The curves show deviations e2360. [2] Golubev, Kovaleva, Yushkin (2008) Fuel 87, 32- of the mean annual and July temperatures during the Holocene 38. [3] Golubev (2009) Doklady Earth Sciences 425, 429-431. from their current values. For this purpose, the statistical [4] Golubev, Kovaleva (2010) Russian Journal of Chemistry, weight of mean temperature values are taken into account in 2. 103-109. paleoclimatic curves approximating, as the temperature ranges in certain intervals of the Holocene vary considerably. According to the palynological data and statistical analyses three periods with warmer climatic conditions (Early Boreal, Middle Subboreal and Late Atlantic) were estimated. It is established, that climatic optimum have developed at the end of the Atlantic period to what distribution of the most thermophilic tree species (oak, elm, hazel and maple) and the highest temperatures testifies. The Atlantic period is characterized by mean July temperature on 2.5–3.5 °C and mean annual temperature on 2–3 °C warmer, than at the present time. The Boreal and Subboreal temperature maxima had the subordinated value. Thus, from the Preboreal period the increase tendency of temperatures up to the maximal values at the end of the Atlantic period is observed. Then reduction of temperatures to the present has followed. This research was supported by grant by the Program of Presidium RAS n. 14.

[1] Golubeva (2008) Lithosphere. 2. 124-132. [2] Savina & Khotinsky (1982) Evolution of the environment at the USSR territory during Late Pleistocene and Holocene 244 p.

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